<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id: Log.class.php 2791 2012-02-29 10:08:57Z liu21st $


/**
 +------------------------------------------------------------------------------
 * 日志处理类
 +------------------------------------------------------------------------------
 * @category   Think
 * @package  Think
 * @subpackage  Core
 * @author    liu21st <liu21st@gmail.com>
 * @version   $Id: Log.class.php 2791 2012-02-29 10:08:57Z liu21st $
 +------------------------------------------------------------------------------
 */
class Log {
	
	// 日志级别 从上到下，由低到高
	const EMERG = 'EMERG'; // 严重错误: 导致系统崩溃无法使用
	const ALERT = 'ALERT'; // 警戒性错误: 必须被立即修改的错误
	const CRIT = 'CRIT'; // 临界值错误: 超过临界值的错误，例如一天24小时，而输入的是25小时这样
	const ERR = 'ERR'; // 一般错误: 一般性错误
	const WARN = 'WARN'; // 警告性错误: 需要发出警告的错误
	const NOTICE = 'NOTIC'; // 通知: 程序可以运行但是还不够完美的错误
	const INFO = 'INFO'; // 信息: 程序输出信息
	const DEBUG = 'DEBUG'; // 调试: 调试信息
	const SQL = 'SQL'; // SQL：SQL语句 注意只在调试模式开启时有效
	

	// 日志记录方式
	const SYSTEM = 0;
	const MAIL = 1;
	const FILE = 3;
	const SAPI = 4;
	
	// 日志信息
	static $log = array ();
	
	// 日期格式
	static $format = '[ c ]';
	
	/**
     +----------------------------------------------------------
	 * 记录日志 并且会过滤未经设置的级别
     +----------------------------------------------------------
	 * @static
	 * @access public
     +----------------------------------------------------------
	 * @param string $message 日志信息
	 * @param string $level  日志级别
	 * @param boolean $record  是否强制记录
     +----------------------------------------------------------
	 * @return void
     +----------------------------------------------------------
	 */
	static function record($message, $level = self::ERR, $record = false) {
		if ($record || strpos ( C ( 'LOG_LEVEL' ), $level )) {
			$now = date ( self::$format );
			self::$log [] = "{$now} " . $_SERVER ['REQUEST_URI'] . " | {$level}: {$message}\r\n";
		}
	}
	
	/**
     +----------------------------------------------------------
	 * 日志保存
     +----------------------------------------------------------
	 * @static
	 * @access public
     +----------------------------------------------------------
	 * @param integer $type 日志记录方式
	 * @param string $destination  写入目标
	 * @param string $extra 额外参数
     +----------------------------------------------------------
	 * @return void
     +----------------------------------------------------------
	 */
	static function save($type = '', $destination = '', $extra = '') {
		$type = $type ? $type : C ( 'LOG_TYPE' );
		if (self::FILE == $type) { // 文件方式记录日志信息
			if (empty ( $destination ))
				$destination = LOG_PATH . date ( 'y_m_d' ) . '.log';
			
		//检测日志文件大小，超过配置大小则备份日志文件重新生成
			if (is_file ( $destination ) && floor ( C ( 'LOG_FILE_SIZE' ) ) <= filesize ( $destination ))
				rename ( $destination, dirname ( $destination ) . '/' . time () . '-' . basename ( $destination ) );
		} else {
			$destination = $destination ? $destination : C ( 'LOG_DEST' );
			$extra = $extra ? $extra : C ( 'LOG_EXTRA' );
		}
		error_log ( implode ( '', self::$log ), $type, $destination, $extra );
		// 保存后清空日志缓存
		self::$log = array ();
	
		//clearstatcache();
	}
	
	/**
     +----------------------------------------------------------
	 * 日志直接写入
     +----------------------------------------------------------
	 * @static
	 * @access public
     +----------------------------------------------------------
	 * @param string $message 日志信息
	 * @param string $level  日志级别
	 * @param integer $type 日志记录方式
	 * @param string $destination  写入目标
	 * @param string $extra 额外参数
     +----------------------------------------------------------
	 * @return void
     +----------------------------------------------------------
	 */
	static function write($message, $level = self::ERR, $type = '', $destination = '', $extra = '') {
		$now = date ( self::$format );
		$type = $type ? $type : C ( 'LOG_TYPE' );
		if (self::FILE == $type) { // 文件方式记录日志
			if (empty ( $destination ))
				$destination = LOG_PATH . date ( 'y_m_d' ) . '.log';
			
		//检测日志文件大小，超过配置大小则备份日志文件重新生成
			if (is_file ( $destination ) && floor ( C ( 'LOG_FILE_SIZE' ) ) <= filesize ( $destination ))
				rename ( $destination, dirname ( $destination ) . '/' . time () . '-' . basename ( $destination ) );
		} else {
			$destination = $destination ? $destination : C ( 'LOG_DEST' );
			$extra = $extra ? $extra : C ( 'LOG_EXTRA' );
		}
		error_log ( "{$now} " . $_SERVER ['REQUEST_URI'] . " | {$level}: {$message}\r\n", $type, $destination, $extra );
	
		//clearstatcache();
	}
}